I have a 4500s with a 496 garmin for GPS location. I want to add another GPS AF-GPS module 73102. The GPS came with drawings that show wiring for the af-5000. Well I have wired it up per the drawings and can not get it to work. When I cut off my 496 garmin it states no map. I have it conf to port 4. Why will it not work? I have checked power and ground and all is good. What am I missing here?
Thanks
Rush McKelvey